The answer is 84 because 21 times 4 equals 84
Answer:
4 cm
Step-by-step explanation:

Answer:
9-49
a= 2r+ 7
b= 2.5x + 16
c= 3r-2x-8.8
Step-by-step explanation:
When you say congruent the figures must be the same, not just the segments
when you say the segments have equal legnth, only the segments are compared